Serge TKB Kit!

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henk3
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Post by henk3 » Sat Mar 04, 2017 9:51 am

So, thanks for the cart.
I am now building, but..

After populating all capacitors there are left 2pcs 47pF and 4pcs 100pf.
And missing is 2pcs 50pF and 4pcs 22pF.

Is it a coincidence that they are the same amount or am i supposed to use the extra ones instead.

Bummer that i didn't check before ordering.

:hmm:

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henk3
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Post by henk3 » Sat Mar 04, 2017 10:06 am

Ok, moving on to transistors.
I have 2n3904 instead of 2n5179.

Is that ok?

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Post by Permette » Sat Mar 04, 2017 11:27 am

rampy wrote:
jpauty wrote:
dsf wrote:Is the TKB available again? i can't find it on THC website...
No, but you can ask Zthee if he plans another run.
I'd love to see another run on these. I wonder if there is enough demand :hmm:
I'm waiting for another run as well.

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tobb
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Post by tobb » Sat Mar 04, 2017 11:48 am

henk3 wrote:Ok, moving on to transistors.
I have 2n3904 instead of 2n5179.

Is that ok?
yes,works fine,mine are all 3904 except the MSP4250 (you can use PN200 for that one)

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henk3
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Post by henk3 » Sat Mar 04, 2017 12:25 pm

Perfect, thanks tobb.

Now those caps..
Im guessing i could use a 47pF instead of a 50pF, right?

But on the pcb there is 4 22pF.
They are not on the tkb bom;
http://thehumancomparator.net/wordpress ... kbbom1.pdf

So confusing..

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jpauty
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Post by jpauty » Sat Mar 04, 2017 1:58 pm


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henk3
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Post by henk3 » Sat Mar 04, 2017 2:13 pm

Well this is embarrassing, reading the human comparators build guide again,
it clearly states;
"Please note that the four 22pF caps down on the left hand side should be 100pF''.

It also mentions 2n3904 instead of 2n5179.

:doh:

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drwiener
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Post by drwiener » Sat May 06, 2017 5:11 pm

I'd love one of these if anyone has extra kit lying aroundddd.... trade??

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fonik
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Post by fonik » Mon May 15, 2017 5:03 pm

ha, same here... i would be interested in one.
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J3RK
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Post by J3RK » Mon May 15, 2017 5:33 pm

fonik wrote:ha, same here... i would be interested in one.
Time for a Random*Source TKB? :hihi:
Are you lemon? Does your head come to a nub?

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tojpeters
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Post by tojpeters » Mon May 15, 2017 7:55 pm

I'm pretty sure Dmitri still has extras of his version of the TKB.
It is based on CGS boards but has mostly the same functions.
You might be able to get ahold of him on Facebook.
I've built a couple and they work great.
Several mods are possible.

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qp
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Post by qp » Mon Nov 13, 2017 10:34 pm

been troubleshooting a build I did for a while now and I've gotten the TKB to sorta work, but I'm at that stuck point.

When I first powered it up it wasnt doing anything. Went through and rang out each ribbon wire. Found a couple open, so redid all of the headers with better ones. Still nothing. After a little baroosing here I found that I had the ribbons totally not plugged in right. Once I got that all sorted out it began responding to a clock input and outputting voltages. But, when I throw the switch to KB ON, half of the LED's light on (not fully though) and the keyboard or pressure is non-responsive. I've gone through and tested for any shorts to ground on the wiring, but all good. Is it possible I have a bad set of 4050's that got damaged when I had the ribbon cables plugged in wrong? Of course, for the 1st time I soldered all of the IC's directly to the PCB (except the MM74C150) will be the time I have to replace a bunch. :bang:

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jpauty
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Post by jpauty » Tue Nov 14, 2017 7:47 am

Some checks:
- All IC put in the correct direction ?
- All transistors in the correct direction ?

The schematic is here: http://machines.hyperreal.org/manufactu ... chematics/ . It's not a very complex circuit so this can be helpful to track down the mistake.

If it outputs a voltage when there is a clock, then most of the circuit is working. Can you describe precisely what works and what does not work ?

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qp
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Post by qp » Tue Nov 14, 2017 1:44 pm

jpauty wrote:Some checks:
- All IC put in the correct direction ?
- All transistors in the correct direction ?

The schematic is here: http://machines.hyperreal.org/manufactu ... chematics/ . It's not a very complex circuit so this can be helpful to track down the mistake.

If it outputs a voltage when there is a clock, then most of the circuit is working. Can you describe precisely what works and what does not work ?
Just went through again and verified all IC's are correct orientation and correct part. All transistors are in the right direction (as far as the silkscreen is anyway).

When the kb switch is OFF, the sequencer responds to a clock and A-D output voltages based off pot position. Once i switch kb to ON, LED's 9-16 turn on, but dimmed and the KV and Pressure outputs are stuck at 5V. Pressing the key pads does not change these values.

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the bad producer
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Post by the bad producer » Tue Nov 14, 2017 1:58 pm

I've seen 2 revs of the pot boards on this TKB. One pad which was GND on one wasn't GND on the other (the pads at either end of the pot board) IIRC they were swapped? This may be worth checking - ie that GND is going where it should on the panel. I repaired one a while ago and this was one of the issues.

EDIT - that was it - just had a look - one end has two pads only one of which was GND, the other isn't. The TKB I saw had a similar issue to yours, and this was one of the problems, but there were others including dodgy ribbon cables, which had continuity between stages due to misapplication of the header pressed through the cable (and a few other things)

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qp
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Post by qp » Tue Nov 14, 2017 3:08 pm

the bad producer wrote:I've seen 2 revs of the pot boards on this TKB. One pad which was GND on one wasn't GND on the other (the pads at either end of the pot board) IIRC they were swapped? This may be worth checking - ie that GND is going where it should on the panel. I repaired one a while ago and this was one of the issues.

EDIT - that was it - just had a look - one end has two pads only one of which was GND, the other isn't. The TKB I saw had a similar issue to yours, and this was one of the problems, but there were others including dodgy ribbon cables, which had continuity between stages due to misapplication of the header pressed through the cable (and a few other things)
on the pot boards by the headers there are 2 postions. One labeled GND and the other labeled OUT. I have a bus wire running through the 4 GND holes and soldered. On the other end of the boards there are also 2 postions. One labeled GND and the other is not labeled. The top GND pad I have wired to the KB ON/OFF center pos then to a GND pad on the PCB. I've rung out all of the GND points and there is solid continuity.

The headers that I originally ordered sucked. I was finding opens but no shorts. I did go through and replace most (except the pot boards but I didnt find any shorts or opens there) and I just went through and verified every header. No shorts or opens.

D0ops
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Post by D0ops » Tue Nov 14, 2017 9:22 pm

Id be also interested in another run

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sanders
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Post by sanders » Mon Nov 20, 2017 6:57 pm

how did I miss this...

I'd also love to get a kit if they're offered again.. hopefully soon

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MATSmile
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Post by MATSmile » Mon Dec 18, 2017 2:15 pm

Does anyone know if replacing MM74C150 will fix the issue that qp has?
Where can I find one, or maybe someone has a spare one they can sell? Thx :help:

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Triglav
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Post by Triglav » Mon Dec 25, 2017 3:26 pm

Yeah, I would also love another run.

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drip.feed
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Post by drip.feed » Mon Dec 25, 2017 4:06 pm

Coincidence! I’m just about to start making one of the original kits. Ordered the parts last week. :cloud:
Dripfeed

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fonik
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Post by fonik » Mon Dec 25, 2017 4:32 pm

Just as a sidenote, we are about to build a 1st prototype for a R*S Serge TKB. But there is no ETA yet. It is no simple replika and ee changed and added a few things so we will have to see if it all works out well.
Big Boss at fonitronik.de
Tech Buddy at Random*Source/Serge

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Triglav
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Post by Triglav » Mon Dec 25, 2017 4:33 pm

fonik wrote:Just as a sidenote, we are about to build a 1st prototype for a R*S Serge TKB. But there is no ETA yet. It is no simple replika and ee changed and added a few things so we will have to see if it all works out well.
Great news, I was kinda hoping for this! :banana:

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AlanP
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Post by AlanP » Mon Dec 25, 2017 5:02 pm

fonik wrote:Just as a sidenote, we are about to build a 1st prototype for a R*S Serge TKB. But there is no ETA yet. It is no simple replika and ee changed and added a few things so we will have to see if it all works out well.
VERY cool! I'm guessing redesigning so the DIP24 unobtanium IC is not needed?

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realitycontrol
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Post by realitycontrol » Mon Dec 25, 2017 5:59 pm

Fantastic news!
Cheers. :guinness:

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